The Affiant Made an Affidavit about the Affianced

An affidavit is a written statement, typically used as evidence in court, that is made out by oath or affirmation. Occasionally affidavits may appear in local records office with land records or miscellaneous records depending upon the content of the affidavit.

An affiant is one who makes out an affidavit.

Someone who is said to be affianced is engaged to be married.